çekim: geçmiş flatterte · ortaç geflattert · şimdiki flattert · ulaç flatternd
köken: Early New High German flatern, from Middle High German vladeren, probably related to Falter (“moth”). Compare Dutch fladderen, Lithuanian plazdė́ti (“to flutter, beat the wings vigorously”), Latvian pledināt (“to move the wings”).
Die Fahnen flattern im Wind.
Der Vogel geriet in Panik und flatterte mit den Flügeln.
köken: From Middle Chinese 動悸 (MC duwngX gjwijH, literally “move + palpitate”). First attested in Japanese in 1721, in a street theater play referencing a line from the fifth-century Chinese text, 後漢書 /后汉书 (Hòuhànshū, “Book of the Later Han”). Does not appear to be related to phonosemantic and onomatopoeic root どき (doki).